Chemistry Tuition Singapore – The Mole Misconceptions

Misconception 1

The relative molecular mass of water (H₂0) is 18 g.

Correct Concept

Both the relative atomic mass and the relative molecular mass have no units. Thus, the relative molecular mass of water is just 18.

Misconception 2

The mass of one hydrogen atom is 1.0 g.

Correct Concept

The mass of 1.0 mol (6 x 10²³) hydrogen atoms is 1.0 g.

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